Overview
Stiff-person syndrome (SPS) is a rare neurological disorder characterized by progressive stiffness and spasms of axial and proximal limb muscles, often associated with rigidity and a heightened sensitivity to external stimuli 12.Diagnosis
Clinical presentation includes progressive stiffness, spasms, and heightened reflexes 12.
Electromyography (EMG) may show continuous muscle activity and exaggerated reflex responses 2.
Autoantibodies against glutamic acid decarboxylase (GAD) are frequently present but not diagnostic on their own 1.Management
First-line treatments: Baclofen, either oral or intrathecal, is commonly used to manage symptoms 1.
Adjunctive therapies: Benzodiazepines can be used to control spasms, though long-term use requires caution due to potential side effects 1.
Intrathecal baclofen: Requires careful monitoring for catheter complications; noninvasive checks may not detect leaks 1.Special Populations
Drug interactions: Caution with medications like isotretinoin, which may trigger or exacerbate SPS symptoms 2.
Resolution with cessation: Symptoms may resolve upon discontinuation of triggering agents like isotretinoin 2.Key Recommendations
Monitor intrathecal baclofen therapy closely for catheter-related complications, as noninvasive methods may be insufficient 1 (Evidence: Weak).
Consider drug-induced etiology in patients presenting with acute SPS symptoms, especially following initiation of new medications like isotretinoin 2 (Evidence: Weak).
Utilize benzodiazepines cautiously as adjunctive therapy for spasms in SPS, balancing efficacy with potential side effects 1 (Evidence: Moderate).References
1 Bardutzky J, Tronnier V, Schwab S, Meinck HM. Intrathecal baclofen for stiff-person syndrome: life-threatening intermittent catheter leakage. Neurology 2003. link
2 Chroni E, Sakkis T, Georgiou S, Monastirli A, Pasmatzi E, Paschalis C et al.. Stiff-person syndrome associated with oral isotretinoin treatment. Neuromuscular disorders : NMD 2002. link00118-9)